| 1 | /* |
| 2 | * PowerPC CPU initialization for qemu. |
| 3 | * |
| 4 | * Copyright 2016, David Gibson, Red Hat Inc. <dgibson@redhat.com> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | #include "system/hw_accel.h" |
| 22 | #include "system/kvm.h" |
| 23 | #include "kvm_ppc.h" |
| 24 | #include "system/cpus.h" |
| 25 | #include "qemu/error-report.h" |
| 26 | #include "qapi/error.h" |
| 27 | #include "qapi/visitor.h" |
| 28 | #include "cpu-models.h" |
| 29 | |
| 30 | typedef struct { |
| 31 | const char *name; |
| 32 | uint32_t pvr; |
| 33 | uint64_t pcr; |
| 34 | uint64_t pcr_level; |
| 35 | |
| 36 | /* |
| 37 | * Maximum allowed virtual threads per virtual core |
| 38 | * |
| 39 | * This is to stop older guests getting confused by seeing more |
| 40 | * threads than they think the cpu can support. Usually it's |
| 41 | * equal to the number of threads supported on bare metal |
| 42 | * hardware, but not always (see POWER9). |
| 43 | */ |
| 44 | int max_vthreads; |
| 45 | } CompatInfo; |
| 46 | |
| 47 | static const CompatInfo compat_table[] = { |
| 48 | /* |
| 49 | * Ordered from oldest to newest - the code relies on this |
| 50 | */ |
| 51 | { /* POWER6, ISA2.05 */ |
| 52 | .name = "power6", |
| 53 | .pvr = CPU_POWERPC_LOGICAL_2_05, |
| 54 | .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | |
| 55 | PCR_COMPAT_2_06 | PCR_COMPAT_2_05 | PCR_TM_DIS | PCR_VSX_DIS, |
| 56 | .pcr_level = PCR_COMPAT_2_05, |
| 57 | .max_vthreads = 2, |
| 58 | }, |
| 59 | { /* POWER7, ISA2.06 */ |
| 60 | .name = "power7", |
| 61 | .pvr = CPU_POWERPC_LOGICAL_2_06, |
| 62 | .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | |
| 63 | PCR_COMPAT_2_06 | PCR_TM_DIS, |
| 64 | .pcr_level = PCR_COMPAT_2_06, |
| 65 | .max_vthreads = 4, |
| 66 | }, |
| 67 | { |
| 68 | .name = "power7+", |
| 69 | .pvr = CPU_POWERPC_LOGICAL_2_06_PLUS, |
| 70 | .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | |
| 71 | PCR_COMPAT_2_06 | PCR_TM_DIS, |
| 72 | .pcr_level = PCR_COMPAT_2_06, |
| 73 | .max_vthreads = 4, |
| 74 | }, |
| 75 | { /* POWER8, ISA2.07 */ |
| 76 | .name = "power8", |
| 77 | .pvr = CPU_POWERPC_LOGICAL_2_07, |
| 78 | .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07, |
| 79 | .pcr_level = PCR_COMPAT_2_07, |
| 80 | .max_vthreads = 8, |
| 81 | }, |
| 82 | { /* POWER9, ISA3.00 */ |
| 83 | .name = "power9", |
| 84 | .pvr = CPU_POWERPC_LOGICAL_3_00, |
| 85 | .pcr = PCR_COMPAT_3_10 | PCR_COMPAT_3_00, |
| 86 | .pcr_level = PCR_COMPAT_3_00, |
| 87 | /* |
| 88 | * POWER9 hardware only supports 4 threads / core, but this |
| 89 | * limit is for guests. We need to support 8 vthreads/vcore |
| 90 | * on POWER9 for POWER8 compatibility guests, and it's very |
| 91 | * confusing if half of the threads disappear from the guest |
| 92 | * if it announces it's POWER9 aware at CAS time. |
| 93 | */ |
| 94 | .max_vthreads = 8, |
| 95 | }, |
| 96 | { /* POWER10, ISA3.10 */ |
| 97 | .name = "power10", |
| 98 | .pvr = CPU_POWERPC_LOGICAL_3_10, |
| 99 | .pcr = PCR_COMPAT_3_10, |
| 100 | .pcr_level = PCR_COMPAT_3_10, |
| 101 | .max_vthreads = 8, |
| 102 | }, |
| 103 | { /* POWER11, ISA3.10 */ |
| 104 | .name = "power11", |
| 105 | .pvr = CPU_POWERPC_LOGICAL_3_10_P11, |
| 106 | .pcr = PCR_COMPAT_3_10, |
| 107 | .pcr_level = PCR_COMPAT_3_10, |
| 108 | .max_vthreads = 8, |
| 109 | }, |
| 110 | }; |
| 111 | |
| 112 | static const CompatInfo *compat_by_pvr(uint32_t pvr) |
| 113 | { |
| 114 | int i; |
| 115 | |
| 116 | for (i = 0; i < ARRAY_SIZE(compat_table); i++) { |
| 117 | if (compat_table[i].pvr == pvr) { |
| 118 | return &compat_table[i]; |
| 119 | } |
| 120 | } |
| 121 | return NULL; |
| 122 | } |
| 123 | |
| 124 | static bool pcc_compat(PowerPCCPUClass *pcc, uint32_t compat_pvr, |
| 125 | uint32_t min_compat_pvr, uint32_t max_compat_pvr) |
| 126 | { |
| 127 | const CompatInfo *compat = compat_by_pvr(compat_pvr); |
| 128 | const CompatInfo *min = compat_by_pvr(min_compat_pvr); |
| 129 | const CompatInfo *max = compat_by_pvr(max_compat_pvr); |
| 130 | |
| 131 | g_assert(!min_compat_pvr || min); |
| 132 | g_assert(!max_compat_pvr || max); |
| 133 | |
| 134 | if (!compat) { |
| 135 | /* Not a recognized logical PVR */ |
| 136 | return false; |
| 137 | } |
| 138 | if ((min && (compat < min)) || (max && (compat > max))) { |
| 139 | /* Outside specified range */ |
| 140 | return false; |
| 141 | } |
| 142 | if (compat->pvr > pcc->spapr_logical_pvr) { |
| 143 | /* Older CPU cannot support a newer processor's compat mode */ |
| 144 | return false; |
| 145 | } |
| 146 | if (!(pcc->pcr_supported & compat->pcr_level)) { |
| 147 | /* Not supported by this CPU */ |
| 148 | return false; |
| 149 | } |
| 150 | return true; |
| 151 | } |
| 152 | |
| 153 | bool ppc_check_compat(PowerPCCPU *cpu, uint32_t compat_pvr, |
| 154 | uint32_t min_compat_pvr, uint32_t max_compat_pvr) |
| 155 | { |
| 156 | PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); |
| 157 | |
| 158 | #if !defined(CONFIG_USER_ONLY) |
| 159 | g_assert(cpu->vhyp); |
| 160 | #endif |
| 161 | |
| 162 | return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr); |
| 163 | } |
| 164 | |
| 165 | bool ppc_type_check_compat(const char *cputype, uint32_t compat_pvr, |
| 166 | uint32_t min_compat_pvr, uint32_t max_compat_pvr) |
| 167 | { |
| 168 | PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(object_class_by_name(cputype)); |
| 169 | return pcc_compat(pcc, compat_pvr, min_compat_pvr, max_compat_pvr); |
| 170 | } |
| 171 | |
| 172 | int ppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr, Error **errp) |
| 173 | { |
| 174 | const CompatInfo *compat = compat_by_pvr(compat_pvr); |
| 175 | CPUPPCState *env = &cpu->env; |
| 176 | PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); |
| 177 | uint64_t pcr; |
| 178 | |
| 179 | if (!compat_pvr) { |
| 180 | pcr = 0; |
| 181 | } else if (!compat) { |
| 182 | error_setg(errp, "Unknown compatibility PVR 0x%08"PRIx32, compat_pvr); |
| 183 | return -EINVAL; |
| 184 | } else if (!ppc_check_compat(cpu, compat_pvr, 0, 0)) { |
| 185 | error_setg(errp, "Compatibility PVR 0x%08"PRIx32" not valid for CPU", |
| 186 | compat_pvr); |
| 187 | return -EINVAL; |
| 188 | } else { |
| 189 | pcr = compat->pcr; |
| 190 | } |
| 191 | |
| 192 | cpu_synchronize_state(CPU(cpu)); |
| 193 | |
| 194 | if (kvm_enabled() && cpu->compat_pvr != compat_pvr) { |
| 195 | int ret = kvmppc_set_compat(cpu, compat_pvr); |
| 196 | if (ret < 0) { |
| 197 | error_setg_errno(errp, -ret, |
| 198 | "Unable to set CPU compatibility mode in KVM"); |
| 199 | return ret; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | cpu->compat_pvr = compat_pvr; |
| 204 | env->spr[SPR_PCR] = pcr & pcc->pcr_mask; |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | typedef struct { |
| 209 | uint32_t compat_pvr; |
| 210 | Error **errp; |
| 211 | int ret; |
| 212 | } SetCompatState; |
| 213 | |
| 214 | static void do_set_compat(CPUState *cs, run_on_cpu_data arg) |
| 215 | { |
| 216 | PowerPCCPU *cpu = POWERPC_CPU(cs); |
| 217 | SetCompatState *s = arg.host_ptr; |
| 218 | |
| 219 | s->ret = ppc_set_compat(cpu, s->compat_pvr, s->errp); |
| 220 | } |
| 221 | |
| 222 | int ppc_set_compat_all(uint32_t compat_pvr, Error **errp) |
| 223 | { |
| 224 | CPUState *cs; |
| 225 | |
| 226 | CPU_FOREACH(cs) { |
| 227 | SetCompatState s = { |
| 228 | .compat_pvr = compat_pvr, |
| 229 | .errp = errp, |
| 230 | .ret = 0, |
| 231 | }; |
| 232 | |
| 233 | run_on_cpu(cs, do_set_compat, RUN_ON_CPU_HOST_PTR(&s)); |
| 234 | |
| 235 | if (s.ret < 0) { |
| 236 | return s.ret; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* To be used when the machine is not running */ |
| 244 | int ppc_init_compat_all(uint32_t compat_pvr, Error **errp) |
| 245 | { |
| 246 | CPUState *cs; |
| 247 | |
| 248 | CPU_FOREACH(cs) { |
| 249 | PowerPCCPU *cpu = POWERPC_CPU(cs); |
| 250 | int ret; |
| 251 | |
| 252 | ret = ppc_set_compat(cpu, compat_pvr, errp); |
| 253 | |
| 254 | if (ret < 0) { |
| 255 | return ret; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | int ppc_compat_max_vthreads(PowerPCCPU *cpu) |
| 263 | { |
| 264 | const CompatInfo *compat = compat_by_pvr(cpu->compat_pvr); |
| 265 | int n_threads = CPU(cpu)->nr_threads; |
| 266 | |
| 267 | if (cpu->compat_pvr) { |
| 268 | g_assert(compat); |
| 269 | n_threads = MIN(n_threads, compat->max_vthreads); |
| 270 | } |
| 271 | |
| 272 | return n_threads; |
| 273 | } |
| 274 | |
| 275 | static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name, |
| 276 | void *opaque, Error **errp) |
| 277 | { |
| 278 | uint32_t compat_pvr = *((uint32_t *)opaque); |
| 279 | const char *value; |
| 280 | |
| 281 | if (!compat_pvr) { |
| 282 | value = ""; |
| 283 | } else { |
| 284 | const CompatInfo *compat = compat_by_pvr(compat_pvr); |
| 285 | |
| 286 | g_assert(compat); |
| 287 | |
| 288 | value = compat->name; |
| 289 | } |
| 290 | |
| 291 | visit_type_str(v, name, (char **)&value, errp); |
| 292 | } |
| 293 | |
| 294 | static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name, |
| 295 | void *opaque, Error **errp) |
| 296 | { |
| 297 | char *value; |
| 298 | uint32_t compat_pvr; |
| 299 | |
| 300 | if (!visit_type_str(v, name, &value, errp)) { |
| 301 | return; |
| 302 | } |
| 303 | |
| 304 | if (strcmp(value, "") == 0) { |
| 305 | compat_pvr = 0; |
| 306 | } else { |
| 307 | int i; |
| 308 | const CompatInfo *compat = NULL; |
| 309 | |
| 310 | for (i = 0; i < ARRAY_SIZE(compat_table); i++) { |
| 311 | if (strcmp(value, compat_table[i].name) == 0) { |
| 312 | compat = &compat_table[i]; |
| 313 | break; |
| 314 | |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | if (!compat) { |
| 319 | error_setg(errp, "Invalid compatibility mode \"%s\"", value); |
| 320 | goto out; |
| 321 | } |
| 322 | compat_pvr = compat->pvr; |
| 323 | } |
| 324 | |
| 325 | *((uint32_t *)opaque) = compat_pvr; |
| 326 | |
| 327 | out: |
| 328 | g_free(value); |
| 329 | } |
| 330 | |
| 331 | void ppc_compat_add_property(Object *obj, const char *name, |
| 332 | uint32_t *compat_pvr, const char *basedesc) |
| 333 | { |
| 334 | gchar *namesv[ARRAY_SIZE(compat_table) + 1]; |
| 335 | gchar *names, *desc; |
| 336 | int i; |
| 337 | |
| 338 | object_property_add(obj, name, "string", |
| 339 | ppc_compat_prop_get, ppc_compat_prop_set, NULL, |
| 340 | compat_pvr); |
| 341 | |
| 342 | for (i = 0; i < ARRAY_SIZE(compat_table); i++) { |
| 343 | /* |
| 344 | * Have to discard const here, because g_strjoinv() takes |
| 345 | * (gchar **), not (const gchar **) :( |
| 346 | */ |
| 347 | namesv[i] = (gchar *)compat_table[i].name; |
| 348 | } |
| 349 | namesv[ARRAY_SIZE(compat_table)] = NULL; |
| 350 | |
| 351 | names = g_strjoinv(", ", namesv); |
| 352 | desc = g_strdup_printf("%s. Valid values are %s.", basedesc, names); |
| 353 | object_property_set_description(obj, name, desc); |
| 354 | |
| 355 | g_free(names); |
| 356 | g_free(desc); |
| 357 | } |